[Bug 260126] syslog(3) spins the CPU with 4180 byte messages

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260126

--- Comment #3 from Alan Somers <asomers@FreeBSD.org> ---
There's nothing wrong with SO_RCVBUF=4kB.  That's the default, and rsyslogd
never changes it.  I think the solution is to:
1) Change syslog(3)'s MAXLINE to 4kB, so it's the same as the default SO_RCVBUF
2) Maybe change the loop around ENOBUFS in vsyslog1, but no change is obviously
correct.  Perhaps fail fast if cnt > 1024, or perhaps query the socket's true
sockbuf size, but I'm not sure how to do that.

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